【题目】It has been long since I ______ from her last.
A.had heard
B.has heard
C.heard
D.hears

【答案】C
【解析】A. had heard过去完成时态；B. has heard现在完成时态；C. heard一般过去时；D. hears一般现在时；句意：自从上次得到她的音信后，已经好久没有她的消息了。在句型“It has been +时间段+since从句”中，since从句的谓语动词用一般过去时，故选C。